Vat dyestuff.



are boiled together with 60 UNITED srrarns PATENT oFFioE.

PAUL THOMASCHEWSKI. 0F VOHWINKEL, NEAR ELBERFELD, GERMANY, ASSIGNOR T0 FABBENFABRIKEN VORM. FRIEDR. BAYER & 60., 0F ELBERFELD, GERMANY, A COR- PORATION OF GERMANY.

VAT DYESTUFF.

memos.

No Drawing.

$pecification of Letters Patent.

Application filed March 26, 1912. Serial No. 686,348.

Patented Nov, 19 1912.

To all whom it may concern:

(R meaning an anthraquinone radical) are from yellow to orange powders soluble in concentrated sulfuric acid generally with from a blue to green coloration.

In order to illustrate the new process more fully the following example is given, the parts being by weight:10 parts of anthraquinone-2-mercaptan (sodium salt) and 3' parts of 1.5-dichloroanthraquinone parts of naphthalene during 10 hours. The new thioether precipitates during the reaction as a yellow crystalline powder. The precipitate is filtered ofl", washed with alcohol and water.

The trianthraquinonyldithioether having mostprobably the formula:

is after being dried and pulverized an orange-yellow powder crystallizing from uinolin in the shape of orange-yellow neeles which are soluble in m'onohydratedsulfuric acid with a greenish-blue coloration and dyeing cotton from an alkaline hydrosulfite vat a pure yellow shade fast to chlorin and to light. The dye can also be produced from 1..) anthraquinone-dimercaptan and 2 uol. EZ-bromo anthraquinone.

Other anthraquinone lnercaptans or other dichloroanthraquinones c. g. 1.8-,1. 1-,1.6-,or

2.7 dichloroanthraquinone may be used.

I claim 1. The herein described new vat dyes being dithioet-hers of the anthraquinone series having most probably the formula:

RS-RSR (R meaning an anthraquinone radical) being soluble 111 concentrated sulfuric acid with from a blue to green coloration; and

dyeing cotton from the hydrcsulfite vat generally from yellow to orange to red fast shades, substantially as described.

2. The herein described new vat dye being which is after being dried and pulverized an orange-yellow powder crystallizing from quinolin in the shape of orange-yellow needles being soluble in monohydrated sulfuric acid with a greenish-blue coloration; and dyeing cotton from the alkaline hydrosulfite vat pure yellow fast shades, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

mpies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

